Modeling Form -sphere charcoal

Hi Matt, 

I loved drawing this sphere. I did it first with a 2b pencil only. Then a couple days later went over it in charcoal. I like both versions. I’ll post the pencil version directly after this one just for comparison.

Is there something I could have done better with the background? 
 
Thanks as always, really appreciate your insight.

-Kim

(It’s darker than it appears in the photo.)